Re: OS Backup versus RMAN

From: Michael Austin <>
Date: Thu, 28 Aug 2008 23:00:32 -0500
Message-ID: <IvKtk.21028$>

Dereck L. Dietz wrote:
> Does anybody know where I could find a time comparison between an operating
> system backup and an RMAN backup?
> Thanks.

RMAN backs up only the data blocks and depending on your options as Daniel stated, only CHANGED blocks.

If you create a 1TB datafile - in OS you will back up 1TB of nothing. In RMAN you get only what you asked for. And further more, your backup is worthless if it cannot be restored and be consistent. Use RMAN.

While most folks see that RMAN has been around since late 8i/early 9i, the methodology was borrowed from that other great DB that Oracle owns called Oracle Rdb (OpenVMS only- formerly DEC Rdb-where the optimizer, partitioning, LMT and a whole host of other features came from) although, RMAN is somewhat more tailorable to your environment. Received on Thu Aug 28 2008 - 23:00:32 CDT

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